381856877 has 2 divisors, whose sum is σ = 381856878. Its totient is φ = 381856876.

The previous prime is 381856843. The next prime is 381856883. The reversal of 381856877 is 778658183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224580196 + 157276681 = 14986^2 + 12541^2 .

It is a cyclic number.

It is not a de Polignac number, because 381856877 - 2¹² = 381852781 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381856577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190928438 + 190928439.

It is an arithmetic number, because the mean of its divisors is an integer number (190928439).

Almost surely, 2^381856877 is an apocalyptic number.

It is an amenable number.

381856877 is a deficient number, since it is larger than the sum of its proper divisors (1).

381856877 is an equidigital number, since it uses as much as digits as its factorization.

381856877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 53.

The square root of 381856877 is about 19541.1585378145. The cubic root of 381856877 is about 725.4935217621.

The spelling of 381856877 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, eight hundred seventy-seven".